Flask



FIG. 1 is a front, left, perspective view of a flask showing our new design;

FIG. 2 is a right side elevational view thereof, the front, rear and left side elevational views being identical, excluding the threaded portion of the flask pour spout;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a flask, as shown and described. 